Answer
$$2\sqrt{23}$$
Work Step by Step
Plugging in $x=4$:
$$\sqrt{20+2\cdot \:4^2} \\ 2\sqrt{13}$$
Plugging in $x=6$:
$$\sqrt{20+2\cdot \:6^2} \\ 2\sqrt{23}$$
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 2 - Functions - Review Exercises and Problems for Chapter Two - Page 109: 4
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